Visual microphone captures tiny vibrations on the surfaces of objects caused by sound waves and turns them into audible signals

https://phys.org/news/2025-07-based-visual-microphone.html

"simplifies/ reduces cost using light to capture sound, enables applications in scenarios where traditional microphones ineffective as long as light to passes through... single-pixel computational imaging of sound... recover sound using surface vibrations of objects such as leaves, paper... signal processing filter enhances high-frequency... no expensive lasers, high-speed cameras... sound-induced motion causes subtle changes in light intensity... environmental monitoring, security, industrial diagnostics"

Related: Nanodevice uses sound to sculpt light, paving the way for better displays and imaging
https://www.eurekalert.org/news-releases/1093148